Using the Desired-Available formula for drug dosage calculation:

  \[   \text{Tablets} = \frac{\text{Desired dose}}{\text{Available dose per tablet}}   = \frac{0.25 \text{ mg}}{0.125 \text{ mg per tablet}} = 2 \text{ tablets}   \]

  Critical nursing points for Digoxin:

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• Assess apical pulse for 1 full minute before administering
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• Withhold and notify physician if pulse < 60 bpm (adults) or < 100 bpm (infants)
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• Therapeutic range: \( 0.5\text{–}2.0 \text{ ng/mL} \)
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• Toxicity signs: bradycardia, nausea/vomiting, visual disturbances (yellow-green halos), arrhythmias
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• Hypokalemia increases digoxin toxicity risk